Precision tuning of a thin-film notch filter

Orr, W. A.

doi:10.1109/isscc.1964.1157529

Cited by 7 publications

(1 citation statement)

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“…The 1/s term takes the integration of the frequency difference by the phase comparator into account. The open-loop transfer function is given by (23) (24) and the closed-loop transfer function in terms of the output voltage V. and input deviation Oi is given by…”

Section: Small-signal Properties Of the Apllmentioning

confidence: 99%

MiniaturizedRCFilters Using Phase Locked Loop

Moschytz¹

1965

Bell System Technical Journal

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It is shown that an automatic phase-locked loop (APLL) can be used as a bandpass filter and FM discriminator while satisfying the circuit conditions imposed by microminiaturization techniques. It has the advantage over other methods of ease of adjustment and reduction in the number of circuit components. For this reason it is to be assumed that the APLL will be added to the few practical solutions of the f1·equency selection problem in microminiaturization available to date.In contrast to most other applications, no assumptions can be made here about the ratio of the natural undamped system f1'equency to the lock range of the loop. This is taken account of in an analysis of the APLL which enables design equoiion« and considerations to be derived. A n approximation of the so-called capture ratio, defined as the ratio of capture-to-lock range, is presented. It produces results that correspond very well with the equivalent measurements.The description of an APLL designed as RC channel filter and discriminator for a multichannel data receiver is presented. RC active circuits that are compatible with current microminiaturization techniques are employed exclusively. They are described in detail, and an analysis of the voltage-controlled oscillator used is 7ncluded 7n the Appendix.

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Section: Small-signal Properties Of the Apllmentioning

confidence: 99%